<url>
    <lisp>(format "<loc>%s/%s</loc>" (ob:get-header "URL") (ob:post-htmlfile POST))</lisp>
    <lisp>(format "<lastmod>%s</lastmod>" (ob:format-date (ob:post-timestamp POST)))</lisp>
    <changefreq>weekly</changefreq>
    <priority>0.8</priority>
  </url>

